QUOTE (Dan-Dare @ Mar 30 2008, 10:25 AM)

Researchers at Purdue University have further developed a technology that could represent a pollution-free energy source for a range of potential applications, from golf carts to submarines and cars to emergency portable generators.
Purdue researchers demonstrate their method for producing hydrogen by adding water to an alloy of aluminum and gallium. The hydrogen could then be used to run an internal combustion engine or a fuel cell. The reaction was discovered by Jerry Woodall, center, a distinguished professor of electrical and computer engineering. Charles Allen, holding test tube, and Jeffrey Ziebarth, both doctoral students in the School of Electrical and Computer Engineering, are working with Woodall to perfect the process.
The technology produces hydrogen by adding water to an alloy of aluminum and gallium. When water is added to the alloy, the aluminum splits water by attracting oxygen, liberating hydrogen in the process. The Purdue researchers are developing a method to create particles of the alloy that could be placed in a tank to react with water and produce hydrogen on demand.
This sounds entirely plausible - a friend in my dorm who is an electrical engineer showed me a material he got a little bit of at an internship, a strange alloy of two metals, that when he tapped it to a 9 volt battery catastrophically rearranged its atoms and heated up to thousands of degrees releasing a lot of energy that was stored in its structure. And while this certainly could be a easy way to carry a material that will generate a lot of hydrogen per unit mass, that's not the point. The point I was trying to make is that these various hydrogen-generation methods (including this one) are not energy sources. they are dense ways of storing energy.
When the alloy is mixed with water the potential energy in the bonds present in the metal are transferred into the hydrogen-hydrogen covalent bonds. And when you MAKE the alloy, the potential energy in its bonds has to come from somewhere. Ultimately you have to take something you find in nature and drop it to a lower energy/higher entropy state in order to get energy in the first place, regardless if its burning fossil fuels or fissioning uranium or light turned into heat in a solar panel or heat transferred to a cold area in a heat engine. If they were marketing this as an emergency fuel or a dense way to "store" hydrogen (Just add water!

) I would have no issue. When they call it an energy source, or like in the video say it could "Solve the energy crisis" I get very irritated.
Its worth noting that the claim that it could be a "pollution free" energy source is false, unless you ONLY make the stuff using power generated from clean energy sources. You're just moving the energy generation elsewhere, and introducing inefficiencies. If you have to use fossil fuels to run your car, its honestly probably better to burn it as efficiently as possible in the cars where the least amount of energy will go to waste than to burn it at a power plant and then transfer it in steps that will inevitably have inefficiencies.